What type of stoichiometric defect is shown by ZnS ?

Frenkel defect or dislocation defect is observed in Zinc sulphide. This defect arises due to the hole in cationic lattice site and the cation occupying an interstitial position. This is because the size of the cation, i.e Zinc, is smaller than the anion and hence it occupies the interstitial site leaving behind a hole or vacant.

E M B I B E

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 11

MEDIUM

12th West Bengal Board

IMPORTANT

Earn 100

A compound is formed by two elements $A$ and $B$ . Atoms of the element $B$ (as anions) are in $ccp$ arrangement and those of the element $A$ as cations occupy all the octahedral voids. What is the formula of the compound?

Important Questions on Solid State

EASY

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 12

A compound formed by elements

A

and

B

crystallizes in the cubic arrangement in which atoms

A

are at the corners of the cube and atoms

B

at the face centres. What is the formula of the compound?

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 13

An element crystallizes in face centred cubic lattice. Calculate the length of the side of the unit cell if the radius of atom is

200 pm

.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 14

Chromium metal crystallizes in a body centred cubic lattice. The length of the unit cell edge is found to be

287 pm

. Calculate the atomic radius of chromium.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 15

The atomic radius of an element which crystallizes in body centred cubic lattice, is

120 pm

. Calculate the lattice constant.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 16

If the radius of the bromide ion is

0.182

nm

, how large a cation can fit in each of the tetrahedral holes?

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 17

An element crystallizes in a structure having

fcc

unit cell of an edge

200 pm .

Calculate the density if

200 g

of this element contains

24 \times 10^{23}

atoms.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 18

Silver forms

ccp

lattice and

X

-ray studies of its crystals show that the edge length of its unit cell is

408.6 pm

. Calculate the density of silver (Atomic mass

= 107.9 u

).

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 1 - Solid State>Follow Up Problems>Q 19

An element (at. mass $= 60$ ) having face centred cubic unit cell has a density of $6.23 g {cm}^{- 3} .$ What is the edge length of the unit cell? (Avogadro's constant $= 6.023 \times 10^{23}$ ).